Apparatus for eliminating moire in scanned image and method...

Details Apparatus for eliminating moire in scanned image and method... Apparatus for eliminating moire in scanned image and method...

2003-03-24

2008-03-11

Poon, King Y. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003260, C358S001900, C358S003030, C382S167000, C382S260000, C382S275000

Reexamination Certificate

active

07342688

ABSTRACT:
A method for eliminating moire in scanned digital image comprises the steps of using an average circuit for taking weighted average and error diffusing a gray level difference between an error diffusion pixel Gijand neighbor pixels to neighbor to obtain output image pixel Y′ij; using a second adder for subtracting the error diffusion pixel Gijfrom the output image pixel Y′ijto obtain a neighbor image error dij; using a error filter H(z) to process the neighbor image error dijto obtain a corrected pixel error H(d(i,j)); and using a first adder for adding the corrected pixel error H(d(i,j)) and the input image pixel Yijto obtain the corrected error diffusion pixel Gij, and then jumping to first step until all pixels being processed. The method provides real time treatment for eliminating moire and provide smooth image.

REFERENCES:
patent: 5351137 (1994-09-01), Kato et al.
patent: 5592592 (1997-01-01), Shu
patent: 7057773 (2006-06-01), Ilbery

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